www.project-moonshot.org Git - mech_eap.orig/blob - init_sec_context.c

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "gssapiP_eap.h"
  34
  35 static OM_uint32
  36 policyVariableToFlag(enum eapol_bool_var variable)
  37 {
  38     OM_uint32 flag = 0;
  39
  40     switch (variable) {
  41     case EAPOL_eapSuccess:
  42         flag = CTX_FLAG_EAP_SUCCESS;
  43         break;
  44     case EAPOL_eapRestart:
  45         flag = CTX_FLAG_EAP_RESTART;
  46         break;
  47     case EAPOL_eapFail:
  48         flag = CTX_FLAG_EAP_FAIL;
  49         break;
  50     case EAPOL_eapResp:
  51         flag = CTX_FLAG_EAP_RESP;
  52         break;
  53     case EAPOL_eapNoResp:
  54         flag = CTX_FLAG_EAP_NO_RESP;
  55         break;
  56     case EAPOL_eapReq:
  57         flag = CTX_FLAG_EAP_REQ;
  58         break;
  59     case EAPOL_portEnabled:
  60         flag = CTX_FLAG_EAP_PORT_ENABLED;
  61         break;
  62     case EAPOL_altAccept:
  63         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  64         break;
  65     case EAPOL_altReject:
  66         flag = CTX_FLAG_EAP_ALT_REJECT;
  67         break;
  68     }
  69
  70     return flag;
  71 }
  72
  73 static struct eap_peer_config *
  74 peerGetConfig(void *ctx)
  75 {
  76     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  77
  78     return &gssCtx->initiatorCtx.eapPeerConfig;
  79 }
  80
  81 static Boolean
  82 peerGetBool(void *data, enum eapol_bool_var variable)
  83 {
  84     gss_ctx_id_t ctx = data;
  85     OM_uint32 flag;
  86
  87     if (ctx == GSS_C_NO_CONTEXT)
  88         return FALSE;
  89
  90     flag = policyVariableToFlag(variable);
  91
  92     return ((ctx->flags & flag) != 0);
  93 }
  94
  95 static void
  96 peerSetBool(void *data, enum eapol_bool_var variable,
  97             Boolean value)
  98 {
  99     gss_ctx_id_t ctx = data;
 100     OM_uint32 flag;
 101
 102     if (ctx == GSS_C_NO_CONTEXT)
 103         return;
 104
 105     flag = policyVariableToFlag(variable);
 106
 107     if (value)
 108         ctx->flags |= flag;
 109     else
 110         ctx->flags &= ~(flag);
 111 }
 112
 113 static unsigned int
 114 peerGetInt(void *data, enum eapol_int_var variable)
 115 {
 116     gss_ctx_id_t ctx = data;
 117
 118     if (ctx == GSS_C_NO_CONTEXT)
 119         return FALSE;
 120
 121     assert(CTX_IS_INITIATOR(ctx));
 122
 123     switch (variable) {
 124     case EAPOL_idleWhile:
 125         return ctx->initiatorCtx.idleWhile;
 126         break;
 127     }
 128
 129     return 0;
 130 }
 131
 132 static void
 133 peerSetInt(void *data, enum eapol_int_var variable,
 134            unsigned int value)
 135 {
 136     gss_ctx_id_t ctx = data;
 137
 138     if (ctx == GSS_C_NO_CONTEXT)
 139         return;
 140
 141     assert(CTX_IS_INITIATOR(ctx));
 142
 143     switch (variable) {
 144     case EAPOL_idleWhile:
 145         ctx->initiatorCtx.idleWhile = value;
 146         break;
 147     }
 148 }
 149
 150 static struct wpabuf *
 151 peerGetEapReqData(void *ctx)
 152 {
 153     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 154
 155     return &gssCtx->initiatorCtx.reqData;
 156 }
 157
 158 static void
 159 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 160 {
 161 }
 162
 163 static const struct wpa_config_blob *
 164 peerGetConfigBlob(void *ctx, const char *name)
 165 {
 166     return NULL;
 167 }
 168
 169 static void
 170 peerNotifyPending(void *ctx)
 171 {
 172 }
 173
 174 static struct eapol_callbacks gssEapPolicyCallbacks = {
 175     peerGetConfig,
 176     peerGetBool,
 177     peerSetBool,
 178     peerGetInt,
 179     peerSetInt,
 180     peerGetEapReqData,
 181     peerSetConfigBlob,
 182     peerGetConfigBlob,
 183     peerNotifyPending,
 184 };
 185
 186 extern int wpa_debug_level;
 187
 188 static OM_uint32
 189 peerConfigInit(OM_uint32 *minor,
 190                gss_cred_id_t cred,
 191                gss_ctx_id_t ctx,
 192                int loadConfig)
 193 {
 194     krb5_context krbContext;
 195     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 196     krb5_error_code code;
 197     char *identity;
 198
 199     GSSEAP_KRB_INIT(&krbContext);
 200
 201     if (loadConfig) {
 202         eapPeerConfig->fragment_size = 1024;
 203         wpa_debug_level = 0;
 204     }
 205
 206     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 207     if (code != 0) {
 208         *minor = code;
 209         return GSS_S_FAILURE;
 210     }
 211
 212     eapPeerConfig->identity = (unsigned char *)identity;
 213     eapPeerConfig->identity_len = strlen(identity);
 214     eapPeerConfig->password = (unsigned char *)cred->password.value;
 215     eapPeerConfig->password_len = cred->password.length;
 216
 217     return GSS_S_COMPLETE;
 218 }
 219
 220 static OM_uint32
 221 peerConfigFree(OM_uint32 *minor,
 222                gss_ctx_id_t ctx)
 223 {
 224     krb5_context krbContext;
 225     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 226
 227     GSSEAP_KRB_INIT(&krbContext);
 228
 229     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 230
 231     return GSS_S_COMPLETE;
 232 }
 233
 234 static OM_uint32
 235 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 236 {
 237     OM_uint32 major;
 238     const unsigned char *key;
 239     size_t keyLength;
 240
 241     /* Cache encryption type derived from selected mechanism OID */
 242     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 243     if (GSS_ERROR(major))
 244         return major;
 245
 246     if (ctx->encryptionType != ENCTYPE_NULL &&
 247         eap_key_available(ctx->initiatorCtx.eap)) {
 248         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 249
 250         major = gssEapDeriveRfc3961Key(minor, key, keyLength,
 251                                        ctx->encryptionType, &ctx->rfc3961Key);
 252         if (GSS_ERROR(major))
 253             return major;
 254
 255         major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 256                                            &ctx->checksumType);
 257         if (GSS_ERROR(major))
 258             return major;
 259     } else {
 260         /*
 261          * draft-howlett-eap-gss says that integrity/confidentialty should
 262          * always be advertised as available, but if we have no keying
 263          * material it seems confusing to the caller to advertise this.
 264          */
 265         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 266     }
 267
 268     major = sequenceInit(minor,
 269                          &ctx->seqState,
 270                          ctx->recvSeq,
 271                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 272                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 273                          TRUE);
 274     if (GSS_ERROR(major))
 275         return major;
 276
 277     return GSS_S_COMPLETE;
 278 }
 279
 280 static OM_uint32
 281 eapGssSmInitAuthenticate(OM_uint32 *minor,
 282                          gss_cred_id_t cred,
 283                          gss_ctx_id_t ctx,
 284                          gss_name_t target,
 285                          gss_OID mech,
 286                          OM_uint32 reqFlags,
 287                          OM_uint32 timeReq,
 288                          gss_channel_bindings_t chanBindings,
 289                          gss_buffer_t inputToken,
 290                          gss_buffer_t outputToken)
 291 {
 292     OM_uint32 major;
 293     OM_uint32 tmpMajor, tmpMinor;
 294     time_t now;
 295     int initialContextToken = 0, code;
 296     gss_buffer_desc respBuf = GSS_C_EMPTY_BUFFER;
 297
 298     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 299                            inputToken->length == 0);
 300
 301     major = peerConfigInit(minor, cred, ctx, initialContextToken);
 302     if (GSS_ERROR(major))
 303         goto cleanup;
 304
 305     if (initialContextToken) {
 306         struct eap_config eapConfig;
 307
 308         memset(&eapConfig, 0, sizeof(eapConfig));
 309         ctx->flags |= CTX_FLAG_EAP_PORT_ENABLED;
 310
 311         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 312                                                  &gssEapPolicyCallbacks,
 313                                                  ctx,
 314                                                  &eapConfig);
 315
 316         time(&now);
 317         if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 318             ctx->expiryTime = 0;
 319         else
 320             ctx->expiryTime = now + timeReq;
 321
 322         major = gss_duplicate_name(minor, cred->name, &ctx->initiatorName);
 323         if (GSS_ERROR(major))
 324             goto cleanup;
 325
 326         major = gss_duplicate_name(minor, target, &ctx->acceptorName);
 327         if (GSS_ERROR(major))
 328             goto cleanup;
 329
 330         if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 331             major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 332         } else if (gssEapIsConcreteMechanismOid(mech)) {
 333             if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 334                 major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 335         } else {
 336             major = GSS_S_BAD_MECH;
 337         }
 338         if (GSS_ERROR(major))
 339             goto cleanup;
 340
 341         /* If credentials were provided, check they're usable with this mech */
 342         if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 343             major = GSS_S_BAD_MECH;
 344             goto cleanup;
 345         }
 346
 347         respBuf.value = ""; /* emit empty inner token */
 348         major = GSS_S_CONTINUE_NEEDED;
 349         goto cleanup;
 350     } else {
 351         ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 352     }
 353
 354     wpabuf_set(&ctx->initiatorCtx.reqData,
 355                inputToken->value, inputToken->length);
 356
 357     major = GSS_S_CONTINUE_NEEDED;
 358
 359     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 360     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 361         struct wpabuf *resp;
 362
 363         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 364
 365         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 366         if (resp != NULL) {
 367             respBuf.length = wpabuf_len(resp);
 368             respBuf.value = (void *)wpabuf_head(resp);
 369         }
 370     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 371         major = initReady(minor, ctx);
 372         if (GSS_ERROR(major))
 373             goto cleanup;
 374
 375         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 376         major = GSS_S_CONTINUE_NEEDED;
 377         ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
 378     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 379         major = GSS_S_DEFECTIVE_CREDENTIAL;
 380     } else if (code == 0) {
 381         major = GSS_S_FAILURE;
 382     }
 383
 384 cleanup:
 385     if (respBuf.value != NULL) {
 386         OM_uint32 tmpMajor;
 387
 388         assert(major == GSS_S_CONTINUE_NEEDED);
 389
 390         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 391         if (GSS_ERROR(tmpMajor)) {
 392             major = tmpMajor;
 393             *minor = tmpMinor;
 394         }
 395     }
 396
 397     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 398     peerConfigFree(&tmpMinor, ctx);
 399
 400     return major;
 401 }
 402
 403 #if 0
 404 static OM_uint32
 405 eapGssSmInitKeyTransport(OM_uint32 *minor,
 406                          gss_cred_id_t cred,
 407                          gss_ctx_id_t ctx,
 408                          gss_name_t target,
 409                          gss_OID mech,
 410                          OM_uint32 reqFlags,
 411                          OM_uint32 timeReq,
 412                          gss_channel_bindings_t chanBindings,
 413                          gss_buffer_t inputToken,
 414                          gss_buffer_t outputToken)
 415 {
 416     GSSEAP_NOT_IMPLEMENTED;
 417 }
 418
 419 static OM_uint32
 420 eapGssSmInitSecureAssoc(OM_uint32 *minor,
 421                         gss_cred_id_t cred,
 422                         gss_ctx_id_t ctx,
 423                         gss_name_t target,
 424                         gss_OID mech,
 425                         OM_uint32 reqFlags,
 426                         OM_uint32 timeReq,
 427                         gss_channel_bindings_t chanBindings,
 428                         gss_buffer_t inputToken,
 429                         gss_buffer_t outputToken)
 430 {
 431     GSSEAP_NOT_IMPLEMENTED;
 432 }
 433 #endif
 434
 435 static OM_uint32
 436 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 437                                gss_cred_id_t cred,
 438                                gss_ctx_id_t ctx,
 439                                gss_name_t target,
 440                                gss_OID mech,
 441                                OM_uint32 reqFlags,
 442                                OM_uint32 timeReq,
 443                                gss_channel_bindings_t chanBindings,
 444                                gss_buffer_t inputToken,
 445                                gss_buffer_t outputToken)
 446 {
 447     OM_uint32 major, tmpMinor;
 448     gss_iov_buffer_desc iov[2];
 449     gss_buffer_desc buf;
 450
 451     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
 452     iov[0].buffer.length = 0;
 453     iov[0].buffer.value = NULL;
 454
 455     iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 456     iov[1].buffer.length = 0;
 457     iov[1].buffer.value = NULL;
 458
 459     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 460         iov[0].buffer = chanBindings->application_data;
 461
 462     major = gssEapWrapOrGetMIC(minor, ctx, FALSE, FALSE, iov, 2,
 463                                TOK_TYPE_GSS_CB);
 464     if (GSS_ERROR(major))
 465         goto cleanup;
 466
 467     /* Skip past token ID */
 468     assert(iov[1].buffer.length > 2);
 469     assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
 470
 471     buf.length = iov[1].buffer.length - 2;
 472     buf.value = (unsigned char *)iov[1].buffer.value + 2;
 473
 474     major = duplicateBuffer(minor, &buf, outputToken);
 475     if (GSS_ERROR(major))
 476         goto cleanup;
 477
 478     major = GSS_S_COMPLETE;
 479     ctx->state = EAP_STATE_ESTABLISHED;
 480
 481 cleanup:
 482     gssEapReleaseIov(iov, 2);
 483
 484     return major;
 485 }
 486
 487 static OM_uint32
 488 eapGssSmInitEstablished(OM_uint32 *minor,
 489                         gss_cred_id_t cred,
 490                         gss_ctx_id_t ctx,
 491                         gss_name_t target,
 492                         gss_OID mech,
 493                         OM_uint32 reqFlags,
 494                         OM_uint32 timeReq,
 495                         gss_channel_bindings_t chanBindings,
 496                         gss_buffer_t inputToken,
 497                         gss_buffer_t outputToken)
 498 {
 499     /* Called with already established context */
 500     *minor = EINVAL;
 501     return GSS_S_BAD_STATUS;
 502 }
 503
 504 static struct gss_eap_initiator_sm {
 505     enum gss_eap_token_type inputTokenType;
 506     enum gss_eap_token_type outputTokenType;
 507     OM_uint32 (*processToken)(OM_uint32 *,
 508                               gss_cred_id_t,
 509                               gss_ctx_id_t,
 510                               gss_name_t,
 511                               gss_OID,
 512                               OM_uint32,
 513                               OM_uint32,
 514                               gss_channel_bindings_t,
 515                               gss_buffer_t,
 516                               gss_buffer_t);
 517 } eapGssInitiatorSm[] = {
 518     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,  eapGssSmInitAuthenticate        },
 519 #if 0
 520     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,  eapGssSmInitKeyTransport        },
 521     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,  eapGssSmInitSecureAssoc         },
 522 #endif
 523     { TOK_TYPE_NONE,    TOK_TYPE_GSS_CB,    eapGssSmInitGssChannelBindings  },
 524     { TOK_TYPE_NONE,    TOK_TYPE_NONE,      eapGssSmInitEstablished         },
 525 };
 526
 527 OM_uint32
 528 gss_init_sec_context(OM_uint32 *minor,
 529                      gss_cred_id_t cred,
 530                      gss_ctx_id_t *context_handle,
 531                      gss_name_t target_name,
 532                      gss_OID mech_type,
 533                      OM_uint32 req_flags,
 534                      OM_uint32 time_req,
 535                      gss_channel_bindings_t input_chan_bindings,
 536                      gss_buffer_t input_token,
 537                      gss_OID *actual_mech_type,
 538                      gss_buffer_t output_token,
 539                      OM_uint32 *ret_flags,
 540                      OM_uint32 *time_rec)
 541 {
 542     OM_uint32 major;
 543     OM_uint32 tmpMajor, tmpMinor;
 544     gss_ctx_id_t ctx = *context_handle;
 545     struct gss_eap_initiator_sm *sm = NULL;
 546     gss_buffer_desc innerInputToken;
 547     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 548
 549     *minor = 0;
 550
 551     output_token->length = 0;
 552     output_token->value = NULL;
 553
 554     if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
 555         return GSS_S_NO_CRED;
 556     }
 557
 558     if (ctx == GSS_C_NO_CONTEXT) {
 559         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 560             return GSS_S_DEFECTIVE_TOKEN;
 561         }
 562
 563         major = gssEapAllocContext(minor, &ctx);
 564         if (GSS_ERROR(major))
 565             return major;
 566
 567         ctx->flags |= CTX_FLAG_INITIATOR;
 568
 569         *context_handle = ctx;
 570     }
 571
 572     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 573
 574     sm = &eapGssInitiatorSm[ctx->state];
 575
 576     if (input_token != GSS_C_NO_BUFFER) {
 577         major = gssEapVerifyToken(minor, ctx, input_token,
 578                                   sm->inputTokenType, &innerInputToken);
 579         if (GSS_ERROR(major))
 580             goto cleanup;
 581     } else {
 582         innerInputToken.length = 0;
 583         innerInputToken.value = NULL;
 584     }
 585
 586     /*
 587      * Advance through state machine whilst empty tokens are emitted and
 588      * the status is not GSS_S_COMPLETE or an error status.
 589      */
 590     do {
 591         sm = &eapGssInitiatorSm[ctx->state];
 592
 593         major = (sm->processToken)(minor,
 594                                    cred,
 595                                    ctx,
 596                                    target_name,
 597                                    mech_type,
 598                                    req_flags,
 599                                    time_req,
 600                                    input_chan_bindings,
 601                                    &innerInputToken,
 602                                    &innerOutputToken);
 603         if (GSS_ERROR(major))
 604             goto cleanup;
 605     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 606
 607     if (actual_mech_type != NULL) {
 608         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 609             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 610     }
 611     if (innerOutputToken.value != NULL) {
 612         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 613                                    sm->outputTokenType, output_token);
 614         if (GSS_ERROR(tmpMajor)) {
 615             major = tmpMajor;
 616             *minor = tmpMinor;
 617             goto cleanup;
 618         }
 619     }
 620     if (ret_flags != NULL)
 621         *ret_flags = ctx->gssFlags;
 622     if (time_rec != NULL)
 623         gss_context_time(&tmpMinor, ctx, time_rec);
 624
 625     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 626
 627 cleanup:
 628     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 629
 630     if (GSS_ERROR(major))
 631         gssEapReleaseContext(&tmpMinor, context_handle);
 632
 633     gss_release_buffer(&tmpMinor, &innerOutputToken);
 634
 635     return major;
 636 }